{"key": "/works/OL130580W", "title": "The principles and practice of iron and steel manufacture", "first_publish_date": "1906", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL1267355A"}}], "type": {"key": "/type/work"}, "subjects": ["Metallurgy", "Steel", "Iron"], "covers": [15044199], "latest_revision": 3, "revision": 3, "created": {"type": "/type/datetime", "value": "2009-10-19T01:15:33.519862"}, "last_modified": {"type": "/type/datetime", "value": "2025-05-10T14:09:29.381458"}}